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Which outcome arises when doping modulates semiconductor aluminum-gallium-arsenide's band structure?

A)Controlled conductivity via electrons or holes
B)Increased average phonon mean free path
C)Higher intrinsic mechanical stiffness overall
D)Reduced average atomic vibrational frequency

💡 Explanation

Controlled conductivity occurs because doping alters the Fermi level relative to the conduction band via electron/hole creation. Therefore the conductivity changes rather than phonon mean free path increases that relate acoustic properties.

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